Yeah...you see this actually a lot with chronic illnesses (like diabetes). What I've seen is that if a doc feels they cannot help the patient (or they are not following what the doc says), they will no longer treat them.
Luckily, I've never had this problem. However, I do suggest your friend call the doc/facility and DEMAND a referral. If they will not treat him/her, the doc needs to give your friend other options. Even if the Ha1C or numbers are a little shakey, I would imagine they need to help her/him find something else. And yes...your friend needs make sure the numbers are under control. No doctor is going to take on an unstable patient. And, health insurance can take away coverage if the diabetes is not under control also. Diabetic NEED that insurance! Desperately! So, the blood sugar needs to be good.
Was this an endocrinologist? Or, diabetes educator? Do you know what the title of this doc was? That will help find a replacement.
Ketoret, I had the same experience as your daughter. It's REALLY tough during this time. I was diagnosed when I was 4, and I rebelled from ages 12-17 with my numbers. And, college is just HORRIBLE for diabetes. Does your daughter have a set schedule in her life? Once I got a career in teaching, my diabetes has been turned on it's head- I'm being praised for my ability to stay under control. A stable environment and schedule is very important.